<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>99乘法表</title>
    <script>
      function print99() {
        /* 双层for写法 */
        for (let i = 1; i <= 9; i++) {
          for (let j = 1; j <= i; j++) {
            document.write(`${j} × ${i} = ${i * j}&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`)
          }
          document.write('<br/>')
        }
      }

      print99()

      /* 单层for写法 */
    </script>
  </head>
  <body></body>
</html>
